Finding the Fourth Proportional to 1,353.20, 1,867.55 and 763.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.20 : 1,867.55 = 763.72 : x
2. Step 2: Convert to fraction form
   1,353.20/1,867.55 = 763.72/x
3. Step 3: Cross multiply
   1,353.20x = 1,867.55 × 763.72
4. Step 4: Simplify right side
   1,353.20x = 1,426,276.80
5. Step 5: Solve for x
   x = 1,426,276.80/1,353.20
6. Step 6: Final answer
   x = 1,054.01